1213103131 has 2 divisors, whose sum is σ = 1213103132. Its totient is φ = 1213103130.

The previous prime is 1213103107. The next prime is 1213103219. The reversal of 1213103131 is 1313013121.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1213103131 - 2⁹ = 1213102619 is a prime.

It is a super-2 number, since 2×1213103131² = 2943238412884006322, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1213104131) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 606551565 + 606551566.

It is an arithmetic number, because the mean of its divisors is an integer number (606551566).

Almost surely, 2^1213103131 is an apocalyptic number.

1213103131 is a deficient number, since it is larger than the sum of its proper divisors (1).

1213103131 is an equidigital number, since it uses as much as digits as its factorization.

1213103131 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 54, while the sum is 16.

The square root of 1213103131 is about 34829.6300726838. The cubic root of 1213103131 is about 1066.5123967106.

Adding to 1213103131 its reverse (1313013121), we get a palindrome (2526116252).

The spelling of 1213103131 in words is "one billion, two hundred thirteen million, one hundred three thousand, one hundred thirty-one".